中国南海南沙群岛海域鸢乌贼耳石微量元素组成特性

Trace elements in statoliths of Sthenoteuthis oualaniensis in Nansha Islands of the South China Sea

摘要:

为了解鸢乌贼耳石微量元素组成特征，根据2017年3—5月我国灯光罩网渔船于中国南海南沙群岛海域采集的1 002尾鸢乌贼样本，利用激光剥蚀电感耦合等离子体质谱法(LA-ICP-MS)分析了17枚鸢乌贼耳石微量元素的组成及分布。结果显示，南沙群岛海域鸢乌贼耳石主要由56种微量元素组成，含量最多的前10种元素依次为Ca、Sr、Na、P、Si、K、Mg、Fe、Ba和B。方差分析结果显示，不同性别间，前10种元素Ca、Sr、Na、P、Si、K、Mg、Fe、Ba、B的分布均无显著差异；不同孵化期的群体间Ca、Sr、Na、P、Si、K、Mg、Fe、Ba、B的分布也不存在显著差异，但不同耳石部位间Si、K、Fe无显著差异，而Ca、Sr、Na、P、Mg、Ba、B则存在显著差异。研究表明，不同的生境会导致鸢乌贼耳石微量元素组成的不同，且在不同的生长阶段，鸢乌贼耳石微量元素组成也存在差异，但不同性别鸢乌贼耳石微量元素组成基本一致。本研究进一步证实了利用微量元素分布特性鉴定头足类种群和研究洄游路线的可行性。

关键词:鸢乌贼;耳石;微量元素;激光剥蚀电感耦合等离子质谱法;南沙群岛;中国南海

Abstract:

In order to explore the trace element composition characteristics of Sthenoteuthis oualaniensis, the composition and distribution of trace elements in 17 statoliths of S. oualaniensis collected in the Nansha islands waters of the South China Sea during March to May by light falling-net vessels in 2017 were analyzed with laser ablation inductively coupled plasma mass spectrometry (LA-ICP-MS). The results showed that the statolith of S. oualaniensis contained 56 elements, and calcium (Ca), strontium (Sr), sodium (Na), phosphorus (P), silicon (Si), potassium (K), magnesium (Mg), iron (Fe), barium (Ba) and boron (B) were the ten most abundant elements. The analysis of variance (ANOVA) showed that there was no significant difference in the distribution of all ten most abundant elements between different sexes and hatching groups. There were significant differences in the contents of Ca, Sr, Na, P, Mg, Ba and B, but no significant difference in the contents of Si, K and Fe between different areas of the statolith. The study showed that the trace element composition of S. oualaniensis varied in different habitats and in different growth stages, but the trace element composition of S. oualaniensis of different sexes was basically the same, which further confirmed the feasibility of using trace element distribution characteristics to identify cephalopod populations and study migratory routes.

Key words:Sthenoteuthis oualaniensis;statolith;trace element;LA- ICP- MS;Nansha Islands;the South China Sea